/bin = BINaries
/dev = DEVices
/etc = ETCetera  附加物或  EdiTable Configure file 配置文件
/proc = PROCesses
/sbin = Superuser BINaries
/usr = Unix Shared Resources


apt = Advanced Packaging Tool
bash = Bourne Again SHell
cal = CALendar 连续
cat = CATenate
cd = Change Directory
chgrp = CHange GRouP
chmod = CHange MODe 模式
chown = CHange OWNer
chsh = CHange SHell
cmp = compare
df = Disk Free
du = Disk Usage
fdisk  暂无 磁盘分区命令
grep search for a pattern using regular expression
ln = LiNk
ls = list
mkfs = MaKe FileSystem
nl = Number of Lines
nm = names
od = Octal Dump 八进制  倒垃圾，倾泻
pwd = Print Working Directory
rpm = RPM Package Manager = RedHat Package Manager
stty = Set TTY
su = Substitute User 代替用户
sudo = super user do
tar = tape archive  整理归档
tty = TeleTypewriter
umask = User‘s MASK 面具
vi = VIsual = Very Inconvenient
vim = Vi IMproved
wall = write all
wc = Word Count
wine = WINE Is Not an Emulator
xargs = eXtended ARGuments